Sankey energy card has empty space in section layout

[raghu-ranganathan]

Checklist

• I have updated to the latest available Home Assistant version.
• I have cleared the cache of my browser.
• I have tried a different browser to see if it is related to my browser.
• I have tried reproducing the issue in safe mode to rule out problems with unsupported custom resources.

Describe the issue you are experiencing

When using the Energy Sankey card in a view with section layout, there is empty space in the bottom portion of the card - see screenshot attached with the empty space marked up with a “?”

[update] energy Sankey card used in a conditional card.

This empty space is present in both horizontal and vertical layout options for the sankey card.

Maybe the long (jumbled) text for each of the circuits and the many circuits shown in the last section is influencing the vertical size of the card. Not sure if there is a way to simplify the display by limiting the last section to top (n=4 or 5) circuits as well as using a “remain” to capture a total the rest.

Note: this card in the energy dashboard does not show an empty space in the bottom portion of that card.

Describe the behavior you expected

Less empty space within the Energy Sankey card when used in a section layout.

Steps to reproduce the issue

1. assuming the energy dashboard configuration has been set up and the energy Sankey card is visible there. (Also, maybe, 20+ circuits in the last section with long names?)
2. Create a view with sections layout and 3 columns. In one of the columns, add the energy Sankey card in a conditional card
3. Use horizontal or vertical layout
4. see empty space in the bottom portion of the card
   ...

What version of Home Assistant Core has the issue?

2025.10.0

What was the last working version of Home Assistant Core?

No response

In which browser are you experiencing the issue?

Companion apps in Android and ipadOS. Also, chrome browser in a windows 11 laptop..

Which operating system are you using to run this browser?

Android 16 and ipadOS 17.7.10 for companion apps. For chrome browser, it is in a windows 11.

State of relevant entities

Problem-relevant frontend configuration

type: energy-sankey
layout: horizontal

JavaScript errors shown in your browser console/inspector

Additional information

No response

[raghu-ranganathan]

The energy Sankey card did not have the empty space when I copied and pasted the vertical stack with the conditional cards to another view with masonry layout.

So, the sectional layout is the cause of the empty space.